Array antenna, method for producing same, and liquid crystal aligning agent for array antenna

An array antenna having a plurality of antenna units, the array antenna comprising:

• a first substrate including a first dielectric substrate, a plurality of patch electrodes formed on the first dielectric substrate, and a plurality of thin-film transistors formed on the first dielectric substrate;
• a second substrate including a second dielectric substrate disposed to face a surface of the first substrate on which the patch electrodes are formed, and a slot electrode formed on a surface of the second dielectric substrate facing the patch electrodes;
• a liquid crystal layer disposed between the first substrate and the second substrate;
• and
• a liquid crystal alignment film formed on a side of at least one of the first substrate and the second substrate and the side is near the liquid crystal layer,
• wherein the liquid crystal alignment film is formed using a polymer composition that contains a polymer having at least one partial structure selected from the group consisting of (V1) to (V5) in a side chain:
• (V1) alkyl groups having 8 to 22 carbon atoms;
• (V2) fluorine-containing alkyl groups having 6 to 18 carbon atoms;
• (V3) monovalent groups in which any one of a benzene ring, a cyclohexane ring, and a heterocyclic ring is bonded to an alkyl group or fluorine-containing alkyl group having 1 to 20 carbon atoms;
• (V4) monovalent groups which have a total of two or more rings of at least one kind selected from the group consisting of a benzene ring, a cyclohexane ring, and a heterocyclic ring, and in which the plurality of rings are bonded directly or via a divalent linking group;
• and
• (V5) monovalent groups having a steroid skeleton and having 17 to 51 carbon atoms.

An array antenna having a plurality of antenna units, the array antenna comprising:

• a first substrate including a first dielectric substrate, a plurality of patch electrodes formed on the first dielectric substrate, and a plurality of thin-film transistors formed on the first dielectric substrate;
• a second substrate including a second dielectric substrate disposed to face a surface of the first substrate on which the patch electrodes are formed, and a slot electrode formed on a surface of the second dielectric substrate facing the patch electrodes;
• a liquid crystal layer disposed between the first substrate and the second substrate;
• and
• a liquid crystal alignment film formed on a side of at least one of the first substrate and the second substrate and the side is near the liquid crystal layer,
• wherein the liquid crystal alignment film is formed using a polymer composition containing a compound having a crosslinkable group.

An array antenna having a plurality of antenna units, the array antenna comprising:

• a first substrate including a first dielectric substrate, a plurality of patch electrodes formed on the first dielectric substrate, and a plurality of thin-film transistors formed on the first dielectric substrate;
• a second substrate including a second dielectric substrate disposed to face a surface of the first substrate on which the patch electrodes are formed, and a slot electrode formed on a surface of the second dielectric substrate facing the patch electrodes;
• a liquid crystal layer disposed between the first substrate and the second substrate;
• and
• a liquid crystal alignment film formed on a side of at least one of the first substrate and the second substrate and the side is near the liquid crystal layer,
• wherein the liquid crystal alignment film is formed using a polymer composition containing a polyimide.

A liquid crystal aligning agent for an array antenna having a plurality of antenna units,

• wherein the array antenna includes:
• a first substrate including a first dielectric substrate, a plurality of patch electrodes formed on the first dielectric substrate, and a plurality of thin-film transistors formed on the first dielectric substrate;
• a second substrate including a second dielectric substrate disposed to face a surface of the first substrate on which the patch electrodes are formed, and a slot electrode formed on a surface of the second dielectric substrate facing the patch electrodes;
• a liquid crystal layer disposed between the first substrate and the second substrate;
• and
• a liquid crystal alignment film formed on a side of at least one of the first substrate and the second substrate and the side is near the liquid crystal layer,
• wherein the liquid crystal aligning agent for an array antenna comprises:
• a compound [M] having at least one selected from the group consisting of a partial structure represented by Formula (1) and a nitrogen-containing heterocyclic ring;
• (in Formula (1), R1 is a hydrogen atom or a monovalent organic group having 1 to 10 carbon atoms;
• R2 and R3 are each independently a divalent organic group, where not both R2 and R3 are aromatic ring groups;
• and “*” represents a bond).